I use a bike poncho, it covers the legs, too, and limits sweating because it is open underneath. Decathlon sells them for cheap, and them works. There is also normal colors, but I prefer to be absurdly visible (I want to see who says "I didn't seen him 🙂)
Every time I use it, I'm amazed I'm dry underneath (the face gets wet).
In any case, even if I don't wear it, I'm unlikely to get soaked, when rain is not that strong. We are not made of sugar!
crosspostated from: https://social.tchncs.de/users/lgsp/statuses/115484700218126774
Now you can also buy rain pants that cover only the upper front part of the legs, like these. They can be worn in a rolled-up way around the hips to be spread out when needed. They are surprisingly practical for lighter rain, since they avoid the issue that you get either wet from the outside, or alternatively from the inside if you wear waterproof clothing.